refactor(reducers): use 'combineReducers'

make 'searchTerm' reducer keep its own state

src/reducers/index.js

@@ -1,19 +1,10 @@
-import { SET_SEARCH_TERM } from '../constants/ActionTypes';
-import setSearchTerm from './setSearchTerm';
+/**
+ * @module reducers
+ */
 
-const initialState = {
-  searchTerm: ''
-};
+import { combineReducers } from 'redux';
+import searchTerm from './searchTerm';
 
-const rootReducer = (state = initialState, action) => {
-  switch (action.type) {
-
-    case SET_SEARCH_TERM:
-      return setSearchTerm(state, action);
-
-    default:
-      return state;
-  }
-};
-
-export default rootReducer;
+export default combineReducers({
+  searchTerm
+});

src/reducers/searchTerm.js

@@ -0,0 +1,24 @@
+/**
+ * @module reducers/searchTerm
+ */
+
+import { SET_SEARCH_TERM }  from '../constants/ActionTypes';
+
+/**
+ *
+ * @param state
+ * @param action
+ * @return {*}
+ */
+export default function searchTerm(state = '', action) {
+
+  switch (action.type) {
+
+    case SET_SEARCH_TERM:
+      return action.searchTerm;
+
+    default:
+      return state;
+  }
+
+}